latihan mrp

RRP (resource requitment planning)

A B

C(3) D(1) C(3) E(2)

item	nomor operasi	work center	operasi	set'up (jam)	waktu operasi (jam)
A	10	1030	assembly	0	3
B	10	1030	assembly	0	4
C	10	1012	milling	0,6	0,6
	20	1020	drilling	2,7	0,7
	30	1012	milling	2,9	0,4
	40	1018	grinding	3	0,6
D	10	1012	milling	0,5	0,5
	20	1020	drilling	3,2	0,3
	30	1018	grinding	2,3	0,2
E	10	1012	milling	0,6	0,2
	20	1020	drilling	2,5	0,5
	30	1012	milling	2,8	0,6
	40	1018	grinding	1,6	0,4

Dengan EOQ:

A = 15

B = 10

C = 20

D = 30

E = 35

WSO= untuk C (milling) = (0,6+2,9)/20+(0,6+0,4) = 1,175 jam

(drilling) = (2,7/20)+(0,7) = 0,835 jam

(grinding) = (3,0/20)+(0,6) = 0,75 jam

WSO= untuk D (milling) = (0,5/30)+(0,5) = 0,516 jam

(drilling) = (3,2/30)+(0,3) = 0,407 jam

(grinding) = (2,3/30)+(0,2) = 0,277 jam

WSO= untuk E (milling) = (0,6+2,8)/35+(0,2+0,6) = 0,897 jam

(drilling) = (2,5/35)+(0,5) = 0,57 jam

(grinding) = (1,6/35)+(0,4) = 0,45 jam

WSO =untuk A(assembly) = (0/15)+(3,0) = 3 jam

WSO =untuk B(assembly) = (0/10)+(4,0) = 4 jam

item	work center	waktu standar operasi per unit
C (Q= 20)	milling	1,175
	drilling	0,835
	grinding	0,75
D (Q = 30)	milling	0,516
	drilling	0,407
	grinding	0,277
E (Q = 35)	milling	0,897
	drilling	0,57
	grinding	0,45
A (Q = 15)	assembly	3
B (Q = 35)	assembly	4

Bill of resource:

A (C & D) = milling = 1,175 (3)+ 0,516 = 4,041

Drilling = 0,835 (3) + 0,407 = 2,912

Grinding = 0,75 (3) + 0,277 = 2,527

B (C & E) = milling = 1,175 (3) + 0,897 (2) = 5,319

Drilling = 0,835 (3)+ 0,57 (2)= 3,645

Grinding = 0,75 (3) + 0,45 (2) = 3,15

work center		waktu standar operasi per unit
		grup produk A		grup produk B
1012 milling	4,041		5,319
1020 drilling	2,912		3,645
1018 grinding	2,527		3,15
1030 assembly	3,00		4,00

Bulan	januari	februari	Maret
Produk A	1000	1200	2500
Produk B	1250	750	1100

Januari

Kebutuhan kapasitas work center milling = 1000 x 4,041+ 1250 x 5,319 = 10689,75

Drilling = 1000 x 2,912+ 1250 x 3,645 = 7468,25

Grinding = 1000 x 2,527+ 1250 x 3,15 = 6464,5

Assembly = 1000 x 3,00 + 1250 x 4,00 = 8000

Februari

Kebutuhan kapasitas work center milling = 1200 x 4,041+ 750 x 5,319 = 8838,45

Drilling = 1200 x 2,912+ 750 x 3,645 = 6228,15

Grinding = 1200 x 2,527+ 750 x 3,15 = 5394,9

Assembly = 1200 x 3,00 + 750 x 4,00 = 6600

Maret

Kebutuhan kapasitas work center milling = 2500 x 4,041+ 1100 x 5,319 = 15953,4

Drilling = 2500 x 2,912+ 1100 x 3,645 = 11289,5

Grinding = 2500 x 2,527+ 1100 x 3,15 = 9782,5

Assembly = 2500 x 3,00 + 1100 x 4,00 = 11900